CN204903069U - Cylindricality body hoop strain soil pressure sensor - Google Patents

Cylindricality body hoop strain soil pressure sensor Download PDF

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Publication number
CN204903069U
CN204903069U CN201520620415.9U CN201520620415U CN204903069U CN 204903069 U CN204903069 U CN 204903069U CN 201520620415 U CN201520620415 U CN 201520620415U CN 204903069 U CN204903069 U CN 204903069U
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China
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cylindrical
cylindrical elastomeric
inductor
pressure sensor
soil pressure
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CN201520620415.9U
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Chinese (zh)
Inventor
王俊刚
智庆玺
张君博
赵迁乔
张伟山
郝先明
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Qingdao University of Technology
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Qingdao University of Technology
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Abstract

The utility model relates to a soil pressure detection field, and concretel, the utility model relates to a cylindricality body hoop strain soil pressure sensor, this soil pressure sensor includes cylindricality elasticity inductor, resistance strain gauge, foil gage lead wire and shell, cylindricality elasticity inductor adopts the cylindricality elasticity entity by elasticity base NULL, the structure that improves the compression modulus is add to cylindricality elasticity inductor, this structure and cylindricality elasticity inductor integrated into one piece, this structure includes interior muscle and stirrup, interior muscle is arranged in the inside of cylindricality elasticity inductor, the stirrup hoop is installed in the side surface of resistance strain gauge's upside or downside cylindricality elasticity inductor. Through shape, size and the closeness of muscle in changing, the compression modulus of change cylindricality elasticity inductor improves measurement accuracy.

Description

Cylindrical body hoop strain soil pressure sensor
Technical field
The utility model relates to soil pressure detection field, specifically, relates to a kind of cylindrical body hoop strain soil pressure sensor.
Background technology
Soil pressure checkout equipment is the visual plant of geotechnological scientific research and engineering detecting, and its accuracy of observation is very important.At present conventional soil pressure checkout equipment is soil pressure cell, and soil pressure cell comprises adventitia and inner membrance, and the soil body directly contacts the adventitia of box body or the inner membrance of a capacity as the sense film of pressure detection, adopts foil gauge or metallic cord to measure the press-bending deformation of film.First, because the rigidity of soil pressure cell and the rigidity of the tested soil body often have a long way to go, main systematic error is formed; Secondly, soil pressure cell parameter calibration value under different medium and condition has a long way to go, and also affects observation effect, and various factors combined action causes that soil pressure cell measuring error is large, measurement result poor reliability; Moreover the compression modulus of diaphragm type sensing element is nonlinear, the demarcation equivalent modulus adopted is definite value, and the equivalent modulus in measuring process under arbitrary stress is real-time change, and thus diaphragm type sensing element equivalent modulus error is very large.
China Patent No. CN200810246302 discloses a kind of soil pressure cell original position caliberating device and method thereof, loads steel plate, reinforced concrete floor, undisturbed soil, rubber bag, lifting jack, reaction frame, earth anchor, latching, rubber blanket, medium coarse sand, string wire frequency determinator and leader cable by arranging in soil pressure cell.The leader cable of soil pressure cell is connected string wire frequency determinator, measures soil pressure cell not by the initial reading under load, carry out rating test by loading, pressurization, unloading and multistage loadings, obtain the quantitative relation between pressure input quantity and rate-adaptive pacemaker amount.This soil pressure cell but be only limitted to demarcate environment similar to service condition when carry out, the pressure observation of many grades measurand cannot be suitable for.
Utility model content
The purpose of this utility model is to provide a kind of cylindrical body hoop strain soil pressure sensor, according to object compression modulus class requirement to be checked, can manufacture and design the cylindrical elastomeric inductor meeting compression modulus requirement, improves reliability and the accuracy of pressure detection.
The technical solution of the utility model is: a kind of cylindrical body hoop strain soil pressure sensor, for measuring the local pressure of the soil body, rock, cement concrete, asphalt concrete material, this soil pressure sensor is with measurand deform in same pace.This soil pressure sensor comprises cylindrical elastomeric inductor, resistance strain gage, foil gauge lead-in wire and shell, resistance strain gage is around the middle part sticking in cylindrical elastomeric inductor, the foil gauge one end that goes between is connected to resistance strain gage, the other end of foil gauge lead-in wire is connected to electric wire strain gauge, shell is wrapped in the periphery of cylindrical elastomeric inductor, described cylindrical elastomeric inductor adopts the cylindrical elastomeric entity be made up of resilient base material, cylindrical elastomeric inductor sets up the structure improving compression modulus, this structure and cylindrical elastomeric inductor one-body molded, this structure comprises interior muscle and stirrup, interior muscle is arranged in the inside of cylindrical elastomeric inductor, stirrup hoop is installed on the upside of resistance strain gage or the side surface of downside cylindrical elastomeric inductor.
Resistance strain gage meets the technical standard under relevant work condition, measures temperature and the inconsistent situation set temperature compensating circuit of operating ambient temperature is revised for this soil pressure sensor.
For avoiding object to be detected this soil pressure sensor had an impact or cause damage, and making this soil pressure sensor be in uniaxial compression state, housing being set outside cylindrical elastomeric inductor, being divided into bladder and hard coat by shell mechanical characteristic.
The intimate of described bladder and cylindrical elastomeric inductor is fitted, and the elastic modulus of bladder is much smaller than the elastic modulus of cylindrical elastomeric inductor.
Described hard coat adopts hollow circuit cylinder cylindrical shell, and is formed between the housing and cylindrical elastomeric inductor of hard coat and protect cavity, protects the flexible material of two ends up and down of cavity to clog, to ensure that cavity is not clogged.Described hard coat adopts Collapsible structure, hard coat can stretch up and down along the generatrix direction of cylindrical elastomeric inductor, regulate hard coat length, hard coat comprises shell protuberance and shell recess, shell recess and shell protuberance are arranged at the top and bottom of hard coat side body respectively, and be connected by the top and bottom of web member with cylindrical elastomeric inductor, shell recess bottom is provided with scalable groove inner chamber, and shell protuberance is installed in groove inner chamber by the mode of grafting.
Described interior muscle adopts perpendicular muscle, and perpendicular muscle is the inside that one or more layers arc distance such as grade is distributed in cylindrical elastomeric inductor, and ring-type to erect ring that muscle encloses coaxial with cylindrical elastomeric inductor.
Described interior muscle adopts conveyor screw, and conveyor screw is laid in the inside of cylindrical elastomeric inductor, and coaxial with cylindrical elastomeric inductor, and spirochetal diameter is less than the diameter of cylindrical elastomeric inductor.
Described interior muscle adopts ring muscle, and ring muscle is distributed in the inside of cylindrical elastomeric inductor, and coaxial with cylindrical elastomeric inductor, and the circle diameter of ring muscle is less than the diameter of cylindrical elastomeric inductor.
Described interior muscle preferably adopts fleece, and fleece hoop is laid in the inside of cylindrical elastomeric inductor, and coaxial with cylindrical elastomeric inductor.
Interior muscle can adopt any one or more combination of above four kinds of structures, interior breaking of muscle and tendon face adopts circle, polygon or flat, interior muscle material can adopt metal and nonmetal, interior muscle structure is as skeleton, interior muscle and cylindrical elastomeric inductor resilient base material are combined together, forms the pressure transducer with different compression modulus.
The utility model also discloses a kind of measuring method of soil pressure sensor, comprises the steps method:
1) according to object compression modulus class requirement to be checked, determine cylindrical elastomeric inductor resilient base material, cylindrical elastomeric inductor sets up the corresponding structure improving compression modulus, manufactures corresponding cylindrical elastomeric inductor;
2) paste resistance strain gage at the middle part of cylindrical elastomeric inductor, and add casing;
3) carry out pressure-hoop strain to this soil pressure sensor to demarcate, obtain nominal pressure-hoop strain corresponding relation, calibration result nominal data recording unit record;
4) this soil pressure sensor entirety is laid in the particular location of object to be checked, the dynamic strain curve of current soil pressure sensor under work load and trial load effect or static strain value is measured respectively by resistance strain gage on soil pressure sensor, and according to the nominal pressure-hoop strain corresponding relation of this soil pressure sensor, obtain dynamic pressure profile or the static pressure force value of soil pressure sensor, thus obtain dynamic pressure value or the static pressure force value of object to be checked.
The principle of work of the utility model soil pressure sensor is:
This soil pressure sensor, under axle pressure effect, produces axial compressive strain, produces transverse strain by poisson effect.Because the pressure-compressive strain curve of cylindrical elastomeric inductor is nonlinear, the pressure formed by poisson effect-hoop strain curve is also nonlinear, its curve is flexible, repeatably, unique, and axle pressure-hoop strain curve that each soil pressure sensor is corresponding unique, can according to the funtcional relationship of the structure of soil pressure sensor composition and axle pressure-hoop strain curve, demarcate the axle pressure-hoop strain corresponding relation of soil pressure sensor, and be stored in nominal data recording unit, as the demarcation axle pressure-hoop strain corresponding relation of soil pressure sensor.By the hoop strain value of strain gage testing on soil pressure sensor, obtain the force value suffered by soil pressure sensor.
The utility model beneficial effect is compared with prior art:
(1) the utility model soil pressure sensor is compared with traditional soil pressure sensor, and adopt resistance strain gage reading to have inheritance, reading is accurate, cost is low;
(2) cylindrical elastomeric inductor preferably adopts Elastic Cylindrical entity, cylindrical elastomeric inductor implements the sensor that can obtain a series of different compression modulus by designs such as inside and outside reinforcements, customizing by surveying Object matching with plan, measuring error can be eliminated to greatest extent;
(3) cylindrical elastomeric inductor adds casing and can eliminate or greatly reduce sensor lateral pressure and shearing action, makes soil pressure sensor operationally uniaxial compression, makes it identical with timing signal stress or close, improve measuring accuracy;
(4) in measuring method by nominal pressure-hoop strain corresponding relation in advance, direct inverse stressing conditions, eliminates the error brought because of the modulus error of calculation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model soil pressure sensor;
Fig. 2 is the schematic diagram of soil pressure sensor stress deformation;
Fig. 3 is the soil pressure sensor schematic diagram of bladder;
Fig. 4 is the soil pressure sensor schematic diagram of hard coat;
Fig. 5 is the central cross-sectional view of Fig. 4;
Fig. 6 is the soil pressure sensor schematic diagram of perpendicular muscle;
Fig. 7 is the soil pressure sensor schematic diagram of ring muscle;
Fig. 8 is the soil pressure sensor schematic diagram of spiral bar;
Fig. 9 is fibroreticulate soil pressure sensor schematic diagram;
Figure 10 is the soil pressure sensor schematic diagram of stirrup.
In figure, 1 cylindrical elastomeric inductor; 2 resistance strain gages; 3 foil gauge lead-in wires; 4 bladders; 5 shell protuberances; 6 shell recesses; 7 protection cavitys; 8 scalable groove inner chambers; 9 web members; 10 flexible materials; 11 stirrups; 12 fleeces; 13 perpendicular muscle; 14 conveyor screws; 15 ring muscle.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the embodiment of the utility model part, instead of whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to protection domain of the present utility model.
Embodiment 1
See Fig. 1, Fig. 2 and Figure 10, the utility model discloses a kind of cylindrical body hoop strain soil pressure sensor, comprises cylindrical elastomeric inductor 1, resistance strain gage 2, foil gauge lead-in wire 3 and shell.
Cylindrical elastomeric inductor 1 adopts Elastic Cylindrical entity, and cylindrical elastomeric inductor 1 is set up and improved the structure of compression modulus, this structure and cylindrical elastomeric inductor 1 one-body molded.Cylindrical elastomeric inductor 1 specifically can adopt rubber and plastics elastomeric material.
Cylindrical elastomeric inductor 1 sets up the structure improving compression modulus, and the concrete structure of this structure is:
(1) adopt in muscle, interior muscle is arranged in the inside of cylindrical elastomeric inductor, by changing the shape of interior muscle, size and closeness, changes the compression modulus of cylindrical elastomeric inductor;
(2) adopt hoop stirrup, one or multi-channel hoop stirrup 11 is installed in the middle part of the side surface of cylindrical elastomeric inductor 1.Wherein, stirrup 11 is specifically installed on upside or the downside of resistance strain gage 2, and stirrup 11 does not contact with resistance strain gage 2.Stirrup 11 not only can play the compression modulus increasing cylindrical elastomeric inductor 1, and due to stirrup 11 outwardly convex, can play the effect of protective resistance foil gauge 2.
Resistance strain gage 2 is around the middle part sticking in cylindrical elastomeric inductor 1, foil gauge 3 one end that go between are connected to resistance strain gage 2, the other end of foil gauge lead-in wire 3 is connected to electric wire strain gauge, for the resistance variations of resistance strain gage 2 is converted to strain variation, and is sent to data recording equipment.
Shell is wrapped in the periphery of cylindrical elastomeric inductor 1, and for carrying out insulation blocking to the cylindrical elastomeric inductor after paster, protection cylindricality elastic sensation answers the distortion of body 1 not receive constraint, eliminates or reduces surrounding soil to the lateral stress of resistance strain gage.
The course of work of the utility model soil pressure sensor is:
1) according to object compression modulus class requirement to be checked, determine cylindrical elastomeric inductor resilient base material, cylindrical elastomeric inductor sets up the corresponding structure improving compression modulus, manufactures corresponding cylindrical elastomeric inductor;
2) paste resistance strain gage 2 at the middle part of cylindrical elastomeric inductor 1, and add casing;
3) carry out pressure-hoop strain to this soil pressure sensor to demarcate, obtain nominal pressure-hoop strain corresponding relation, calibration result nominal data recording unit record;
4) this soil pressure sensor entirety is laid in the particular location of object to be checked, the dynamic strain curve of current soil pressure sensor under work load and trial load effect or static strain value is measured respectively by resistance strain gage on soil pressure sensor, and according to the nominal pressure-hoop strain corresponding relation of this soil pressure sensor, obtain dynamic pressure profile or the static pressure force value of soil pressure sensor, thus obtain dynamic pressure value or the static pressure force value of object to be checked.
Embodiment 2
The structure of the soil pressure sensor of embodiment 2 forms substantially identical with composition and the structure of the soil pressure sensor of embodiment 1, and distinguishing characteristics is:
Shell adopts bladder 4.See Fig. 3, bladder 4 is wrapped in the periphery of cylindrical elastomeric inductor 1, and fit with the intimate of cylindrical elastomeric inductor 1, the elastic modulus of bladder 4 is much smaller than the elastic modulus of cylindrical elastomeric inductor resilient base material, during pressurized, bladder deformation is consistent with the deformation of cylindrical elastomeric inductor, does not answer the deformation of body 1 and resistance strain gage 2 to have an impact to cylindricality elastic sensation.
Embodiment 3
The structure of the soil pressure sensor of embodiment 3 forms substantially identical with composition and the structure of the soil pressure sensor of embodiment 1, and distinguishing characteristics is:
Shell adopts hard coat.See Fig. 4 and Fig. 5, hard coat adopts hollow circuit cylinder cylindrical shell, and is formed between the side body and the sidewall of cylindrical elastomeric inductor 1 of hard coat and protect cavity 7, act as and avoids cylindrical elastomeric inductor and resistance strain gage to be subject to sidewise restraint, raising accuracy of observation.The flexible material of two ends up and down 10 of protection cavity is clogged, and prevents unnecessary material invasion.
Hard coat adopts Collapsible structure, and the concrete structure of hard coat is:
Comprise shell protuberance 5 and shell recess 6, shell recess 6 and shell protuberance 5 are arranged at the top and bottom of hard coat side body respectively, and be connected with the top and bottom of cylindrical elastomeric inductor 1 by web member 9, shell recess 6 bottom is provided with scalable groove inner chamber 7, and shell protuberance 5 is installed in groove inner chamber 7 by the mode of grafting.
Embodiment 4
The structure of the soil pressure sensor of embodiment 4 forms substantially identical with composition and the structure of the soil pressure sensor of embodiment 1, and distinguishing characteristics is:
See Fig. 6, interior muscle adopts perpendicular muscle 13, perpendicular muscle 13 is distributed in the inside of cylindrical elastomeric inductor 1 in one or more layers arc distance such as grade, and ring-type erect muscle to enclose ring coaxial with the bus of cylindrical elastomeric inductor 1, wherein the bus of cylindrical elastomeric inductor 1 is the central axis of cylindrical elastomeric inductor.
Embodiment 5
The structure of the soil pressure sensor of embodiment 5 forms substantially identical with composition and the structure of the soil pressure sensor of embodiment 1, and distinguishing characteristics is:
See Fig. 7 and Fig. 8, interior muscle adopts conveyor screw 14 or ring muscle 15, and conveyor screw 14 or ring muscle 15 are laid in the inside of cylindrical elastomeric inductor 1, and coaxial with cylindrical elastomeric inductor 1, and the circle diameter of conveyor screw 14 or ring muscle 15 is less than the diameter of cylindrical elastomeric inductor 1.
Embodiment 6
The structure of the soil pressure sensor of embodiment 6 forms substantially identical with composition and the structure of the soil pressure sensor of embodiment 1, and distinguishing characteristics is:
See Fig. 9, interior muscle adopts fleece 12, and fleece 12 hoop is laid in the inside of cylindrical elastomeric inductor 1, and coaxial with cylindrical elastomeric inductor 1, fleece 12 inserts in the Non-linear elastic body of cylindrical elastomeric inductor, is melted by the sill of Non-linear elastic body and builds integral with fleece 12.
Interior muscle can adopt any one or more combination of embodiment 4-6 tri-kinds of structures, when adopting multiple interior muscle structure to combine, interior muscle and cylindrical elastomeric inductor resilient base material, as skeleton, combine together by interior muscle structure, form the pressure transducer with different compression modulus.
For increasing the compression modulus amplitude of variation of cylindrical elastomeric inductor, body elasticity sill structure can be answered to carry out physics splicing to cylindricality elastic sensation, as annular concentric, with one heart sector structure, meet job requirement with the compression modulus of the cylindrical elastomeric inductor of physics splicing;
For increasing the compression modulus of cylindrical elastomeric inductor, also the sill of different compression modulus can be merged in proportion, forming " newly " sill between mixing the compression modulus in the middle of aglucon material, making inductor using " newly " sill or making inductor as inductor sill reinforcement.

Claims (8)

1. cylindrical body hoop strain soil pressure sensor, this soil pressure sensor comprises cylindrical elastomeric inductor, resistance strain gage, foil gauge lead-in wire and shell, resistance strain gage is around the middle part sticking in cylindrical elastomeric inductor, the foil gauge one end that goes between is connected to resistance strain gage, the other end of foil gauge lead-in wire is connected to electric wire strain gauge, shell is wrapped in the periphery of cylindrical elastomeric inductor, it is characterized in that: described cylindrical elastomeric inductor adopts the cylindrical elastomeric entity be made up of resilient base material, cylindrical elastomeric inductor sets up the structure improving compression modulus, this structure and cylindrical elastomeric inductor one-body molded, this structure comprises interior muscle and stirrup, interior muscle is arranged in the inside of cylindrical elastomeric inductor, stirrup hoop is installed on the upside of resistance strain gage or the side surface of downside cylindrical elastomeric inductor.
2. cylindrical body hoop strain soil pressure sensor according to claim 1, it is characterized in that: described shell adopts bladder, the intimate of bladder and cylindrical elastomeric inductor is fitted, and the elastic modulus of bladder is much smaller than the elastic modulus of cylindrical elastomeric inductor resilient base material.
3. cylindrical body hoop strain soil pressure sensor according to claim 1; it is characterized in that: described shell adopts hard coat; hard coat adopts hollow circuit cylinder cylindrical shell; formed between the side body of hard coat and the sidewall of cylindrical elastomeric inductor and protect cavity, the flexible material of two ends up and down of protection cavity is clogged.
4. cylindrical body hoop strain soil pressure sensor according to claim 3, it is characterized in that: described hard coat adopts Collapsible structure, comprise shell protuberance and shell recess, shell recess and shell protuberance are arranged at the top and bottom of hard coat side body respectively, and be connected by the top and bottom of web member with cylindrical elastomeric inductor, shell recess bottom is provided with scalable groove inner chamber, and shell protuberance is installed in groove inner chamber by the mode of grafting.
5. the cylindrical body hoop strain soil pressure sensor according to any one of claim 1-3, it is characterized in that: described interior muscle adopts perpendicular muscle, perpendicular muscle is the inside that one or more layers arc distance such as grade is distributed in cylindrical elastomeric inductor, and ring-type to erect ring that muscle encloses coaxial with cylindrical elastomeric inductor.
6. the cylindrical body hoop strain soil pressure sensor according to any one of claim 1-3, it is characterized in that: described interior muscle adopts conveyor screw, conveyor screw is laid in the inside of cylindrical elastomeric inductor, and coaxial with cylindrical elastomeric inductor, spirochetal diameter is less than the diameter of cylindrical elastomeric inductor.
7. the cylindrical body hoop strain soil pressure sensor according to any one of claim 1-3, it is characterized in that: described interior muscle adopts ring muscle, ring muscle is distributed in the inside of cylindrical elastomeric inductor, and coaxial with cylindrical elastomeric inductor, and the circle diameter of ring muscle is less than the diameter of cylindrical elastomeric inductor.
8. the cylindrical body hoop strain soil pressure sensor according to any one of claim 1-3, is characterized in that: described interior muscle adopts fleece, and fleece hoop is laid in the inside of cylindrical elastomeric inductor, and coaxial with cylindrical elastomeric inductor.
CN201520620415.9U 2015-08-17 2015-08-17 Cylindricality body hoop strain soil pressure sensor Withdrawn - After Issue CN204903069U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105115634A (en) * 2015-08-17 2015-12-02 青岛理工大学 A cylinder hoop strain soil pressure transducer and a measurement method
CN106595467A (en) * 2016-12-12 2017-04-26 唐亮 Geotechnical three-axis experiment sample radial deformation sensor and test method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105115634A (en) * 2015-08-17 2015-12-02 青岛理工大学 A cylinder hoop strain soil pressure transducer and a measurement method
CN106595467A (en) * 2016-12-12 2017-04-26 唐亮 Geotechnical three-axis experiment sample radial deformation sensor and test method

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Granted publication date: 20151223

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